Observations of the volcanoes of Io, Loki and Pele, made in 1991 at the ESO during an occultation by Europa

Astronomy and Astrophysics – Astronomy

Scientific paper

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Europa, Infrared Astronomy, Io, Jupiter Satellites, Occultation, Volcanoes, Astronomical Models, Astronomical Photometry, Light Curve, Visual Observation

Scientific paper

Results are presented on Io's hotspot activity deduced from observing the occultation of Io by Europa on February 20, 1991. The visible light curve is used to derive a first determination of the latitude and longitude corrections of the occulting satellite relative to Io with a global model of light scattering over the surface. These corrections are used in the analysis of the infrared light curve. The temperature and size of the major known volcano on Io, Loki, are determined, and evidence of a weak thermal emission from Pele is obtained.

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